420515531 has 4 divisors (see below), whose sum is σ = 421043952. Its totient is φ = 419987112.

The previous prime is 420515507. The next prime is 420515539. The reversal of 420515531 is 135515024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420515531 - 2¹⁸ = 420253387 is a prime.

It is a super-2 number, since 2×420515531² = 353666623624423922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420515531.

It is not an unprimeable number, because it can be changed into a prime (420515539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263015 + ... + 264608.

It is an arithmetic number, because the mean of its divisors is an integer number (105260988).

Almost surely, 2^420515531 is an apocalyptic number.

420515531 is a deficient number, since it is larger than the sum of its proper divisors (528421).

420515531 is an equidigital number, since it uses as much as digits as its factorization.

420515531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528420.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 420515531 is about 20506.4753431690. The cubic root of 420515531 is about 749.1935218422.

The spelling of 420515531 in words is "four hundred twenty million, five hundred fifteen thousand, five hundred thirty-one".